US11511724B2 - Spring brake actuator with an integrated valve unit - Google Patents
Spring brake actuator with an integrated valve unit Download PDFInfo
- Publication number
- US11511724B2 US11511724B2 US17/038,162 US202017038162A US11511724B2 US 11511724 B2 US11511724 B2 US 11511724B2 US 202017038162 A US202017038162 A US 202017038162A US 11511724 B2 US11511724 B2 US 11511724B2
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- United States
- Prior art keywords
- service brake
- brake
- spring
- working chamber
- valve
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- 239000012530 fluid Substances 0.000 claims abstract description 58
- 238000013329 compounding Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 13
- 230000003584 silencer Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/08—Brake cylinders other than ultimate actuators
- B60T17/083—Combination of service brake actuators with spring loaded brake actuators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/26—Compressed-air systems
- B60T13/261—Compressed-air systems systems with both indirect application and application by springs or weights and released by compressed air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/025—Electrically controlled valves
- B60T15/027—Electrically controlled valves in pneumatic systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
- B60T15/043—Driver's valves controlling service pressure brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
- B60T15/12—Driver's valves combined with relay valves or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/002—Air treatment devices
- B60T17/008—Silencer devices
Definitions
- the present invention relates to a spring brake actuator for use in a commercial vehicle, the actuator comprising a service brake, the service brake comprising a service brake housing, a service brake working chamber located in the service brake housing, the service brake working chamber being confined by a diaphragm, a service brake piston being movable along an actuator-longitudinal axis and abutting the diaphragm, the diaphragm applying a brake force onto the service brake piston as a function of pressure inside the service brake working chamber, and a spring located between the service brake piston and the service brake housing, the spring being effective to push the service brake piston against the direction of the brake force.
- Spring brake actuators of the aforementioned type are known from the prior art and are frequently implemented in commercial vehicles to generate brake forces that are applied to the vehicle wheels.
- a valve such as a modulator valve or an anti-compounding valve, is arranged in between the foot pedal of a vehicle and the spring brake actuator to regulate the fluid pressure applied to the service brake and/or the spring brake.
- a modulator valve is utilized to provide an anti-lock braking functionality which prevents the vehicle wheels from locking up during braking, thereby maintaining tractive contact with the road surface. To achieve this, the fluid pressure in the working chamber of the service brake is reduced when a wheel lock is detected.
- An anti-compounding valve is regularly used to ensure that whenever the service brake and the parking brake are applied simultaneously, braking forces would not add up as this may result in damages to brake components and may even lead to brake failure.
- valves In the prior art, these kinds of valves are typically positioned at locations distant from the spring brake actuator. Due to this, pressure lines of considerable lengths are frequently required which might delay the regulation of the fluid pressure by the valves, especially if a compressible fluid, like air, is utilized to pressurize the brake. This increases the control effort required to compensate for this effect. Additionally, the mentioned configuration leads to a complex assembly.
- a spring brake actuator which comprises an anti-compounding check valve integrally located in a spring brake chamber. Locating such a valve in a spring brake chamber has been found to be disadvantageously with regard to maintenance and accessibility of the valve.
- the present disclosure describes a spring brake actuator of the initially mentioned type which overcomes the aforementioned problems as much as possible.
- the actuator comprises a modulator valve unit that is in fluid communication with the service brake working chamber and is configured to regulate the inlet and outlet of fluid into and out of the service brake working chamber, wherein the modulator valve unit comprises a controllable inlet valve being in fluid communication with the service brake working chamber and a controllable outlet valve being in fluid communication with the service brake working chamber and wherein the modulator valve unit is integrated into the spring brake actuator.
- the fluid pressure in the service brake working chamber can be controlled as required.
- the fluid pressure in the service brake working chamber may be reduced in case a wheel lock is detected by opening the outlet valve and closing the inlet valve. Opening the inlet valve and closing the outlet valve, for example, allows for uninfluenced service brake operation.
- the modulator valve unit is arranged adjacent to the service brake working chamber of the service brake. Arranging the modulator valve unit adjacent to the service brake reduces the required lengths of internal pressure ducts and allows for fast response times of the brake with respect to modulator valve inputs.
- the modulator valve unit extends radially outwards with respect to the actuator-longitudinal axis, which is beneficial regarding installation space requirements.
- the housing of the modulator valve unit is formed integrally with the actuator housing. This further pursues the integration approach according to the invention.
- the inlet valve is connected to the service brake working chamber by a pressure inlet duct and the outlet valve is connected to the service brake working chamber by a separate pressure outlet duct.
- the inlet valve and the outlet valve are connected to the service brake working chamber by a common pressure duct.
- the inlet valve is of a normally-open type and/or the outlet valve is of a normally-closed type. This helps to ensure that the anti-lock braking functionality, if deactivated, does not influence the normal service brake operation. Fluid may proceed unobstructed into the service brake working chamber while an outlet of pressure through the outlet valve is inhibited.
- At least one of the inlet valve or the outlet valve is a solenoid valve.
- Such valves are electrically actuated, fast and compact and have thus found to be beneficial for such an integrated device.
- the spring brake actuator further comprises a silencer connected to the outlet valve for reducing noise emissions when fluid exhausts the silencer. Due to high fluid pressures involved, the outflow of fluid might generate excessive noise. To reduce such noise emissions, the use of a silencer has been found to be beneficial.
- the spring brake actuator further comprises a service port connected to the inlet valve for connecting the modulator valve unit to a fluid power supply, preferably via a relay valve or a foot pedal.
- the service port allows for an easy to assemble and fluid-tight connection with the vehicle braking system.
- the invention moreover relates to a spring brake actuator for use in a commercial vehicle, the actuator comprising a service brake and a spring brake, the spring brake comprising a spring brake working chamber, the service brake comprising a service brake working chamber, and a flange being arranged between the service brake and the spring brake.
- the spring brake actuator preferably comprises an anti-compounding valve unit that is in fluid communication with the service brake working chamber and the spring brake working chamber and is configured for regulating a fluid flow into the service brake working chamber and the spring brake working chamber, wherein the valve unit is formed integrally with the flange.
- valve unit in the flange, the unit remains accessible after assembly and my easily be exchanged and/or maintained.
- Both aspects of the invention share the common inventive idea of integrating components of an anti-compounding device or a modulator device into a discrete unit attached to the actuator to enhance accessibility, maintainability and exchangeability.
- the anti-compounding valve unit comprises a service brake pressure port, a spring brake pressure port, a service brake pressure duct connecting the service brake pressure port to the service brake working chamber, a spring brake pressure duct connecting the spring brake pressure port to the spring brake working chamber, a cavity connecting the service brake pressure duct and the spring brake pressure duct, and
- valve piston being movably held within the cavity, wherein the valve piston is movable between a first position at which the valve piston enables a fluid flow from service brake pressure duct to the spring brake pressure duct and blocks the spring brake pressure port, and a second position at which the valve piston blocks a fluid flow between the service brake pressure duct and the spring brake pressure duct and enables a fluid flow through the spring brake pressure duct.
- This design provides an integrated solution to avoid brake-compounding by ensuring that the spring brake and the service brake are not operated simultaneously.
- the service brake when the vehicle is intended to be parked, the service brake is activated by providing pressurized fluid to the service brake pressure port. This pressure also moves the valve piston which in turn blocks the spring brake pressure duct and ensures that the pressure is kept within the spring brake working chamber therewith avoiding that the spring brake adds additional braking force, even when pressure is released at the spring brake pressure port. Thereby, it is avoided that whenever spring brake and service brake are operated simultaneously, also the braking forces of the two brakes add up and potentially damage brake components.
- the valve piston comprises a valve spring abutting a housing section of the cavity for applying a spring force upon the valve piston for moving the valve piston towards the second position.
- the cavity comprises a step limiting the movement of the valve piston in the second position.
- both the spring brake pressure duct and the service brake pressure duct are kept in an open and well defined state.
- the valve piston comprises a basic body having a first circular grove and a second circular groove each having an O-ring fitted therein, wherein the first groove/O-ring is positioned to selectively enable or block a fluid flow from service brake pressure duct to the spring brake pressure duct and wherein the second groove/O-ring is positioned to selectively enable or block a fluid flow through the spring brake pressure duct.
- FIG. 1 shows a spring brake actuator comprising an integrated modulator valve unit according to a preferred embodiment
- FIG. 2 shows a partial view of the spring brake actuator of FIG. 1
- FIG. 3 shows a modulator valve unit block diagram according to the embodiment of FIGS. 1 and 2 ,
- FIG. 4 shows a perspective view of an alternative embodiment of a spring brake actuator comprising an integrated anti-compounding valve
- FIG. 5 shows a perspective view of a flange of the actuator according to FIG. 4 .
- FIGS. 6 a , 6 b show partial views of the actuator according to FIGS. 4 and 5 in different modes of operation
- FIG. 7 shows an explosive view of a piston of the actuator according to FIGS. 4 to 6 .
- FIG. 1 shows a spring brake actuator 2 comprising a spring brake 4 and a service brake 12 , as well as an actuator housing 8 . While the spring brake 4 , which comprises a release bolt 28 for releasing the spring brake 4 , provides an emergency and parking brake functionality, the service brake 12 provides brake forces during normal vehicle braking operation.
- the spring brake 4 which comprises a release bolt 28 for releasing the spring brake 4
- the service brake 12 provides brake forces during normal vehicle braking operation.
- the service brake 12 comprises a service brake housing 14 , in which a working chamber 20 is located.
- the service brake working chamber 20 is confined by a diaphragm 10 .
- the service brake 12 furthermore comprises a service brake piston 18 having a piston rod 6 .
- the service brake piston 18 abuts the diaphragm 10 for applying a brake force to the service brake piston 18 and the piston rod 6 as a function of pressure inside the working chamber 20 .
- the service brake piston 18 is movable along the actuator-longitudinal axis 19 .
- a spring 16 is located in between the service brake piston 18 and the service brake housing 14 .
- the spring brake actuator 2 furthermore comprises a modulator valve unit 26 , the function of which will be detailed with reference to FIG. 2 .
- the modulator valve unit 26 comprises a modulator valve housing 27 .
- the modulator valve unit 26 is integrated into the spring brake actuator 2 .
- the modulator valve unit 26 comprises a service port 24 for connecting the modulator valve unit 26 to a fluid power supply, preferably via a relay valve or a brake foot pedal (not shown).
- the modulator valve unit 26 furthermore comprises a silencer 22 for reducing noise emissions when fluid exhausts the silencer 22 .
- FIG. 2 shows a partial view of the spring brake actuator 2 , especially the modulator valve unit 26 .
- the modulator valve unit 26 comprises an inlet valve 36 being in fluid communication with the working chamber 20 and an outlet valve 32 being in fluid communication with the working chamber 20 .
- the inlet valve 36 is connected to the working chamber 20 by a pressure inlet duct 38 and the outlet valve 32 is connected to the working chamber 20 by a separate pressure outlet duct 30 .
- the inlet valve 36 and the outlet valve 32 are solenoid valves 32 , 36 .
- the inlet solenoid valve 36 is of the normally-open type and the outlet solenoid valve 32 is of the normally-closed type.
- the inlet solenoid valve 36 and the outlet solenoid valve 32 are connected to a solenoid power circuit 34 .
- the inlet solenoid valve 36 is connected to a pressure inlet 42 comprising the service port 24 .
- the outlet solenoid valve 32 is connected to a pressure outlet 40 comprising the silencer 22 .
- FIG. 3 shows the pneumatic and electric dependencies of the solenoid valves 32 and 36 within the modulator valve unit 26 with the help of a block diagram.
- the inlet solenoid valve 36 is connected to an external or internal controller (not shown) via an inlet solenoid connection 48 .
- the outlet solenoid valve 32 is connected to an external or internal controller (not shown) via an outlet solenoid connection 44 .
- Both solenoid valves 32 , 36 are further connectable to ground via a ground connection 46 .
- pressurized fluid is provided via the pressure inlet 42 .
- the pressure inlet 42 is connected to the inlet solenoid valve 36 , which is normally-open. After passing the inlet solenoid valve 36 , fluid is guided via a common pressure duct 50 or two separate pressure ducts 30 , 38 (not shown, see FIG. 2 ) to the working chamber 20 (see FIG. 1 ).
- the pressure duct 50 is furthermore connected to the outlet solenoid valve 32 , which is normally-closed. From there, fluid is guided towards the pressure outlet 40 .
- the anti-lock braking functionality is realized. For instance is the fluid pressure in the working chamber 20 reduced, in case a wheel lock is detected, by opening the outlet solenoid valve 32 and closing the inlet solenoid valve 36 . Without applying electrical power, the inlet solenoid valve 36 is open and the outlet solenoid valve 32 is closed, so that service brake operation is not influenced by the modulator valve unit 26 in this case.
- FIG. 4 shows a perspective view of an alternative embodiment of a spring brake actuator 102 .
- the spring brake actuator 102 comprises a spring brake 104 and a service brake 112 .
- the service brake 112 comprises a service brake housing 114 and is configured to apply a braking force upon a piston rod 106 in the way already described with respect to the first embodiment shown in FIGS. 1 to 3 .
- the spring brake 104 furthermore comprises a spring brake housing 150 .
- a flange 108 is arranged between the service brake 112 and the spring brake 104 .
- An anti-compounding valve unit 126 is formed integrally with the flange 108 .
- the valve unit 126 comprises a service brake pressure port 152 and a spring brake pressure port 154 . These ports 152 , 154 are connected via the valve unit 126 to a service brake working chamber 120 and a spring brake working chamber 122 (not shown in FIG. 4 ) as will be apparent based on FIGS. 6 a and 6 b.
- FIG. 5 shows a perspective view of the flange 108 having the anti-compounding valve unit 126 formed integrally therewith.
- the valve unit 126 comprises the service brake pressure port 152 and the spring brake pressure port 154 .
- FIGS. 6 a and 6 b show partial views of the spring brake actuator 102 in different modes of operation.
- the anti-compounding valve unit 126 comprises the service brake pressure port 152 and the spring brake pressure port 154 .
- the valve unit 126 moreover comprises a service brake pressure duct 158 connecting the service brake pressure port 152 to a service brake working chamber 120 and a spring brake pressure duct 156 connecting the spring brake pressure port 154 to a spring brake working chamber 122 .
- a cavity 160 connects the service brake pressure duct 158 to the spring brake pressure duct 156 .
- a valve piston 162 is movably held within the cavity 160 .
- the valve piston 162 is movable between a first position shown in FIG. 6 a , at which the valve piston 162 enables a fluid flow from service brake pressure duct 158 to the spring brake pressure duct 156 and blocks the spring brake pressure port 154 , and a second position shown in FIG. 6 b , at which the valve piston 162 blocks a fluid flow between the service brake pressure duct 158 and the spring brake pressure duct 156 and enables a fluid flow through the spring brake pressure duct 156 .
- the valve piston 162 comprises a valve spring 170 abutting a housing section of the cavity 160 for applying a spring force upon the valve piston 162 for moving the valve piston 162 towards the second position shown in FIG. 6 b .
- the cavity 160 comprises a step 172 limiting the movement of the valve piston 162 in the second position.
- valve spring 170 With the help of the valve spring 170 , during normal operation, the spring brake pressure duct 156 is kept open so that pressurized fluid can be applied to and released from the spring brake working chamber 122 keeping the spring brake 104 open or closed.
- the valve piston 162 comprises a basic body 174 (see FIG. 7 ) having a first circular grove 176 and a second circular groove 178 each having an O-ring 180 fitted therein.
- the second groove 178 /O-ring 180 is positioned to selectively enable or block a fluid flow from service brake pressure duct 158 to the spring brake pressure duct 156 , wherein the first groove 176 /O-ring 180 is positioned to selectively enable or block a fluid flow through the spring brake pressure duct 156 .
- the service brake 112 When the vehicle is intended to be parked, the service brake 112 is activated by providing pressurized fluid to the service brake pressure port 152 . This pressure moves the valve piston 162 against the force of the spring 170 to the right (as shown in FIG. 6 a ). This blocks the spring brake pressure duct 156 and ensures that the pressure is kept within the spring brake working chamber 122 thereby avoiding that the spring brake 104 closes and adds additional braking force, even when pressure is released at the spring brake pressure port 154 . When the service brake 112 is released, the valve piston 162 moves to the left, thereby reopening the spring brake pressure duct 156 (as shown in FIG. 6 b ).
- Pressurized fluid may now exhaust out of the spring brake pressure port 154 which, in turn, closes the spring brake 104 . Thereby, it is avoided that whenever spring brake 104 and service brake 112 are operated simultaneously, also the braking forces of the two brakes 104 , 112 add up and potentially damage brake components.
- FIG. 7 shows an explosive view of the valve piston 162 of the spring brake actuator 102 .
- the valve piston 162 comprises a basic body 174 having circular grooves 176 , 178 therein. O-rings 180 are attached to the grooves 176 , 178 . Furthermore, a rubber cap 182 is attached to the basic body 174 .
- the valve piston 162 moreover comprises the spring 170 .
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
-
- 2 spring brake actuator
- 4 spring brake
- 6 piston rod
- 8 actuator housing
- 10 diaphragm
- 12 service brake
- 14 service brake housing
- 16 spring
- 18 service brake piston
- 19 actuator-longitudinal axis
- 20 service brake working chamber
- 22 silencer
- 24 service port
- 26 modulator valve unit
- 27 modulator valve housing
- 28 release bolt
- 30 pressure outlet duct
- 32 outlet solenoid valve
- 34 solenoid power circuit
- 36 inlet solenoid valve
- 38 pressure inlet duct
- 40 pressure outlet
- 42 pressure inlet
- 44 outlet solenoid connection
- 46 ground connection
- 48 inlet solenoid connection
- 50 common pressure duct
- 102 spring brake actuator
- 104 spring brake
- 106 piston rod
- 108 flange
- 112 service brake
- 114 service brake housing
- 120 service brake working chamber
- 122 spring brake working chamber
- 126 anti-compounding valve unit
- 150 spring brake housing
- 152 service brake pressure port
- 154 spring brake pressure port
- 156 spring brake pressure duct
- 158 service brake pressure duct
- 160 cavity
- 162 valve piston
- 170 valve spring
- 172 step
- 174 piston basic body
- 176 first circular grove
- 178 second circular groove
- 180 O-ring
- 182 rubber cap
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IN201941042180 | 2019-10-17 | ||
IN201941042180 | 2019-10-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20210114576A1 US20210114576A1 (en) | 2021-04-22 |
US11511724B2 true US11511724B2 (en) | 2022-11-29 |
Family
ID=75445473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/038,162 Active 2040-10-29 US11511724B2 (en) | 2019-10-17 | 2020-09-30 | Spring brake actuator with an integrated valve unit |
Country Status (2)
Country | Link |
---|---|
US (1) | US11511724B2 (en) |
CN (1) | CN112682440A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4086127A1 (en) * | 2021-05-06 | 2022-11-09 | ZF CV Systems Europe BV | Spring brake actuator |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1155173A (en) | 1966-06-13 | 1969-06-18 | Berg Mfg & Sales Co | Emergency brake actuator. |
US5671654A (en) * | 1995-12-05 | 1997-09-30 | Indian Head Industries | Sealed spring brake actuator |
US6079312A (en) * | 1998-05-19 | 2000-06-27 | Indian Head Industries, Inc. | Combined valving system for spring brake actuator |
US6234587B1 (en) * | 1996-12-18 | 2001-05-22 | Knorr-Bremse Systeme Fur Nutzfahrzeuge Gmbh | Compressed-air disk brake |
US6264291B1 (en) * | 1999-09-30 | 2001-07-24 | Alliedsignal Truck Brake System, Co. | Spring brake actuator with integral biased double check valve for anti-compounding and roll-back protection |
US6290309B1 (en) * | 1998-12-18 | 2001-09-18 | Meritor Wabco Vehicle Control Systems | Spring brake actuation for electronically controlled brake system |
EP1275570A2 (en) * | 2001-07-10 | 2003-01-15 | KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH | Braking system with electro-pneumatic modulator |
US6923509B1 (en) * | 1999-12-20 | 2005-08-02 | Cargo Safe, Inc. | Cargo trailer anti-terrorist and anti-theft system |
US20070158146A1 (en) | 2004-07-08 | 2007-07-12 | Potter Laurence J | Brake Actuator |
WO2012164587A2 (en) | 2011-05-26 | 2012-12-06 | Wabco India Limited | Internal breather valve for spring brake actuators |
CN104245452A (en) | 2012-02-10 | 2014-12-24 | 克诺尔商用车制动系统有限公司 | Combined service brake and parking brake cylinder with parking brake piston controlled by the service brake pressure |
-
2020
- 2020-09-28 CN CN202011041458.3A patent/CN112682440A/en active Pending
- 2020-09-30 US US17/038,162 patent/US11511724B2/en active Active
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1155173A (en) | 1966-06-13 | 1969-06-18 | Berg Mfg & Sales Co | Emergency brake actuator. |
US5671654A (en) * | 1995-12-05 | 1997-09-30 | Indian Head Industries | Sealed spring brake actuator |
US6234587B1 (en) * | 1996-12-18 | 2001-05-22 | Knorr-Bremse Systeme Fur Nutzfahrzeuge Gmbh | Compressed-air disk brake |
US6079312A (en) * | 1998-05-19 | 2000-06-27 | Indian Head Industries, Inc. | Combined valving system for spring brake actuator |
US6290309B1 (en) * | 1998-12-18 | 2001-09-18 | Meritor Wabco Vehicle Control Systems | Spring brake actuation for electronically controlled brake system |
US6264291B1 (en) * | 1999-09-30 | 2001-07-24 | Alliedsignal Truck Brake System, Co. | Spring brake actuator with integral biased double check valve for anti-compounding and roll-back protection |
US6923509B1 (en) * | 1999-12-20 | 2005-08-02 | Cargo Safe, Inc. | Cargo trailer anti-terrorist and anti-theft system |
EP1275570A2 (en) * | 2001-07-10 | 2003-01-15 | KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH | Braking system with electro-pneumatic modulator |
US20070158146A1 (en) | 2004-07-08 | 2007-07-12 | Potter Laurence J | Brake Actuator |
WO2012164587A2 (en) | 2011-05-26 | 2012-12-06 | Wabco India Limited | Internal breather valve for spring brake actuators |
CN104245452A (en) | 2012-02-10 | 2014-12-24 | 克诺尔商用车制动系统有限公司 | Combined service brake and parking brake cylinder with parking brake piston controlled by the service brake pressure |
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US20210114576A1 (en) | 2021-04-22 |
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